As in [1]},
in order to compare the \(\chi ^2\)  values for
the cases where different number of colors at different redshifts were used, we
actually use the \(\chi ^2/N\)  (where N is the number of colors and is 6,5 and 4
respectively for the input redshift of \(z<3.4\) ,\(3.4<z<4.5\)  and \(z>4.5\) ) instead of
\(\chi ^2\)  to determine the photometric redshift by obtaining the minimum of
\(\chi ^2/N\)  at a certain redshift. An IDL program is made to search the
photometric redshifts of SDSS-WISE quasars by taking the above factors into account.
